In should be transformed in a new gem, dependent on gravaty, that uses GTK+ to present a GUI for gravaty. It's better to not add this feature to gravaty to keep dependencies number the lowest possible.

It could be useful to even have a GUI component for gravaty where the user will input the owned email address and, selecting the possible options (avatar/profile, formats, sizes, ...) he will see the full URL to use wherever the user likes.